Effects of Exogenous Silicon on Physiological Characteristics of Lycium ruthenicum Seedling under Salt Stress

The effects of silicon(Si) on physiological characteristics of Lycium ruthenicum seedlings under salt stress were studied by investigating leaf chlorophyll,membrane permeability,malondialdehyde(MDA),proline and soluble sugar content.Results showed that chlorophyll,membrane permeability,MDA,proline and soluble sugar content increased significantly compared with control under salt stress.Chlorophyll content and chlorophyll a/chlorophyll b increased significantly,whereas membrane permeability,MDA,proline and soluble sugar content decreased when silicon concentration was above 1 mmol·L-1.Several physiological indices in silicon treatments were less than those in salt stress treatments with increased treatment.The change tendency of chlorophyll,chlorophyll a/chlorophyll b,MDA and proline content of Lycium ruthenicum seedlings in silicon concentration 4 and 8 mmol·L-1 treatments was contrary to that in salt stress treatments showing that the appropriate concentration of exogenous silicon can alleviate the salt injury of Lycium ruthencium seedling.